Page 533 - New Trends in Eco efficient and Recycled Concrete

Sequestration of carbon dioxide by RCAs 481

(A) Plastic pipe

CO 2 gas cylinder Sealed chamber Mg(NO 3 2
Samples
) solution

Vaccum pump

(B)

CO 2 gas cylinder Air gas cylinder Samples in mesh container

) solution
Mg(NO 3 2

Figure 16.1 Schematics of carbonation chambers of RCAs. (A) Pressured chamber
carbonation and (B) gas flow carbonation. RCAs, Recycled concrete aggregates.
Source: Reprinted from Fang, X.L., Xuan, D.X., Poon, C.S., 2017. Empirical modelling of
CO2 uptake by recycled concrete aggregates under accelerated carbonation conditions.
Mater. Struct. 50, with permission from Springer Nature.

ðsampleÞ 5 ð%M C 3 %Theory ðcementÞ
%Potential CO 2
CO 2
ðcementÞÞ 3 100% (16.7)
2 %M C 3 %Initial CO 2
%Uptake ðsampleÞ
ðsampleÞ 5 CO 2 3 100% (16.8)
%Extent CO 2
ðsampleÞ
%Potential CO 2
where
ðsampleÞ is the potential CO 2 uptake of the sample in percentage;
%Potential CO 2